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Mips

LED vs CMH for flowering?

Posted (edited)

I'm trying to decide between CHM and LED for flowering. I use 3.6k of HPS at the moment and my main purpose in changing to LED/CMH is increase quality. Would anyone be able to advise me as to the best type of light? I grow at quite high light intensities (about 900w/sqm of HPS). I want to match that intensity so I'm wondering which of LED and CMH would be most suited to high light intensity..

The thing I keep hearing is that CMH puts out loads of UVB which is great at resin production, whereas LED only produces UVA. I'm new to all this, though so would be very grateful for any advice..

Edited by Mips

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Hi bud, @diyleduk (site sponsor) for leds, have a word with Adam and he'll advise you the best options...he'll pick up this tag sooner or later...

Personally I've switched from hps to led in the last year or so after several decades swearing by hps...imo leds far outstrip hps in quality, yield and electricity savings.

There's several led diaries well worth looking at...:yep:

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Posted (edited)

Thanks, much appreciated! The forum won't allow me to PM as I haven't posted enough, would you know how many posts/threads I need to make? I can't seem to find the answer..

Edited by Mips

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@Mips 50. 
 Change some of your lamps, hps and mh

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9 hours ago, Mips said:

I keep hearing is that CMH puts out loads of UVB which is great at resin production,

 

Not sure who started this forum myth. Anybody who thinks this, needs to look at the SPD for your bulb.  

 

CMH bulbs like the phillips, have no measured UVB, contrary to popular belief. Theirs a specific UV block glass in-place on most of them and the spectrum graph cuts out most the range completely. Some of the newer branded ones ones have UVA and near UV but still very little amounts of UVB, if its even measured on the SPD. (check any SPD for a cmh bulb, You're looking for 280NM-315NM)

 

Theres a lot of miss information with CMH. The spectrum they produce is great and if its dialed in, will certainly increase quality of your crop but its not UVB that does this, its the overall spectrum and the desired photomorphogenic effects we get from this. 

 

-Adam.

 

 

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So is there a discernible difference in resulting quality between CMH and LED? 

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